Apparatus for attaching knife edges to scale parts



" March 19, 1929. DE BROUCKERE 1,706,216

APPARATUS FOR ATTACHING KNIFE EDGES T0 SCALE PARTS Filed July 11, 1927 Patented Mar. 1 9, 1929.

UNlTED STATES PATENT OFFICE.

LEON DE BROUGKEBE, OF BRUSSELS, BELGIUM, ASSIGNOB TO NAAMLOOZE VENNOOTS- CHAP MAATSCHAPPIJ TOT VERAARDIG-ING VAN SNIJMACHINES VOLGEIJS VAN BERKELS PATENT EN VAN ANIDEB-Tll W'ERKTUZGEIN, OF ROTTERDAM,

NETHER- LANDS, A LIMITED LIABILITY CQIVIPANY OF THE NETHERLANDS.

APPARATUS F03 ATTAGHIIIG KNIFE EDGES TO SCALE PARTS.

Application filed July 11, 18537, Serial No. 204,8.54,

This invention relates to an apparatus for attaching the fulcrum blocks or knife edges to scale beams and other scale parts, and has for its object the provision of an apparatus by which tempered fulcrum blocks may be secured to the scale parts without injuring the temper of the fulcrum blocks.

()ther objects will appear from the following description. m l

The lnVGIliZlOll isexemphned 1n the combination and arrangement of parts shown in the accompanying drawing and described in the following specification and it is more particularly pointed out in the appended claim.

In the drawing Fig. l is a sectional view illustrating one form of apparatus for performing the pres ent invention;

F 2 is a view similar to Fig. 1 illustrating a second form of apparatus.

In order to secure a fulcrum block or knife edge to a scale beam or other scale part by soldering, it is necessary of course, to apply heat to the connect d parts and unless the knife edge is made of special material which is not injured by heat, there is danger that the edge will be softened. The present invention provides means for cooling the fulcrum edge of the block so that it may be soldered to the scale beam without injuring the edge. This permits the use of ordinary tool steel without drawing the temper from the fulcrum edge. The cooling effect may be produced, according to the'invention, by means of a bar or block which may be placed either on top or against the knife edge before the soldering is started. The upper apex of the knife edge may be placed in a groove of the cooling block and the block may be provided with a passage for the circulation of a cooling fluid.

In the apparatus shown in Fig. 1, the numeral 10 designates a scale beam or fulcrum support having afulcrum block 11 and in Belgium May 5, i926.

inserted in a dove-tailed recess 12. Suflicient space is provided between the lateral faces of the fulcrum block and the sides of the recess 12 to admit the solder for securing the block to its support. A cooling block 13 i rovided with a notch 14 in one side thereof which fits over the apex of the knife edge 11. The block may be provided with a longitudinal passage 15 for the circulation of a cooling medium. The passage 15 extends from one end to the other of the block and is connected with any suitable circulation system for passing the cooling medium through the opening 15.

in F 2,. the knife edge 11 is allowed to rest on the upper surface of a scale beam or other part 16 to which the block is to be secured. The support 16 in this case is not provided with a recess for the base of the knife edge. In this form of the invention, cooling tube 17 is provided with a slot 18 extending longitudinally through the wall thereof and shaped to fit tightly against the side faces of the knife edge 11. The apex of the knife edge extends into the central passage 19 for the cooling medium so that the apex of the knife edge will be directly in contact with the cooling medium. The tube 1 7 is held by a support 20 and a coil 2i or other apparatus for supplying the electric current for soldering may be mounted on the support 20.

I claim Apparatus for applying a fulcrum member to a support comprising a conduit having a slot in the wall thereof for receiving the apex of the fulcrum member said slot being shaped to fit the lateral faces of said fulcrum member while permitting the apex of said fulcrum member to extend to the interior of the conduit.

In testimony whereof I have signed my name to this specification on this sixteenth day June A. D. 1927.

LEON on BROUCKERE. 

